Exemplo:

S3 # local users made to look like they are from the hub
R$*<$*<$*>$*>$* $3              denest
R$*<$+>$*       $2              basic RFC822 parsing
R$*<>$*         $n              RFC1123 <>
R$=V            $@ $1 @ $w      Nao altera estes usuarios
R$=V@$=w        $@ $1 @ $w
R$-             $@ $1 @ $H      user => user@hub
R$+@$+          $: $1 @ $[$2$]  canonify the hostname
R$+@$=w         $@ $1 @ $H      user@thishost => user@hub
R$=w!$+         $@ $2 @ $H      thishost!user => user@hub
R$+%$=w         $@ $>3 $1 @ $2  handle % hack thishost
R$*             $@ $1           default, unchanged

# /usr/lib/sendmail -bt
ADDRESS TEST MODE
[Note: No initial ruleset 3 call]
Enter <ruleset> <address>
>
#/usr/lib/sendmail -d21.12 -bt
ADDRESS TEST MODE [Note: No initial ruleset 3 call]
Enter <ruleset> <address>